Fuse



Patented Nov. 24,

UNITED STATES PATENT @iiril THOMAS E. MURRAY, OF BROOKLYN, NEVI YORK.

FUSE.

Application led April 11, 1921.

it known that l, Trroims E. MUnnAr, a citizen ot the United States, and resident ot Brooklyn, county oi Kings. and State oi' New York, have invented certain new and useful Improvements in Fuses, of which the following is a speciication.

My invention aims to provide an electric i'use and a method of constructing the same by which such fuse can be manufactured very rapidly and economically'.

The acconipany'ing drawings illustrate embodiments of the invention.

Fig. l is a side elevation ot a fuse of the A ordinary cartridge type;

Fig. 2 is a horizontal section oit the saine in the course of manufacture;

Fig. 3 is a similar section oit the same inse completed g Fig. 1l is a perspective view of a detail ot the same;

Fig. 5 is a perspective view of a fuse with blade type contacts on the ends;

Fig. G is a perspective view ot a detail, and Fig. 7 is a cross-section ot Fig. 6;

llig. 8 is a perspective or' another modi- Vtied construction.

Rete ring to the embodiments of the invention illustrated, the l'use comprises a cylindrical shell l ot paper, asbestos nbre or the like. with one or more fuse strips or links 2 therein, the ends olf the shell being closed by means ol: caps 3 cemented or otherwise fastened on.

i-rccording to the design ol? 'l to 4L, the caps or end pieces 3 constitute the contact members which in ilse are inserted between suitably shaped spring terminals of the line wire. Each cap 3 has a cylindrical portion on the outside oft the shell l to make contact with the line terminals and has a head portion l closing the end of the shell except ior a` narow opening therethrough. On the inner laces ol the heads if and lying within the shell i are inside end plates 5 with tongues 6 projecting inward. The inside plates may be fastened to the head l by spot- Melding or otherwise. They are inserted into the ends of the shell l, with the caps 23, -llitting over such ends holding the parts in position and reintorcing the structure. life have thus a complete case closed at the ends as in Fig. 2, except i'or the slots which are bounded by the tongues 6.

Serial No. 460,219.

rlhe width ot the slots is made sulicient t'or the passage oi the fuse link or links 2 therethrough and between the tongues, and the links are threaded into place atteil the practically closed shell is thus formed. They may be inserted, for example, by means of a needle 8 long enough to extend through and beyond the case and having an eye at its rear end.into which the. flexible end 9 oic the t'use link is inserted and bent back as shown. The Vlink is made oi' suilicient length to allow its two ends to project beyond the casing and to be bent down outside of the heads of the casing as at 10, Fig.

To ensure close contact of the fuse strip and a closing of the heads in the ends of the case, I use spring wedges ll which are forced into the slot between the ends of the it'use strips on one side and tongues 6 on the other side. The wedges are provided with flanges l2 on their outer ends which serve as stops to limit their inward movement and one of which will also bear against the ends l() oiI the fuse strips and press them against the head oil the case. The ifusestrips are thus brought into intimate contact with the conducting metal oit the head or contact member of the case. Preferably the inside plate 5 and tongues G are formed of copper as well as the endpieces 8 and heads 4;.

In the construction of Figs. 5, G and 7, :tuse strips 2 are simliarly threaded through the casing and are lett with their ends projecting therefrom, as shown at the le'ft of Fig. 3.4 A filler of plastic material 13 or asbestos iibre or the like is introduced between the projecting ends of the strips and above and below the top and bottom strips and projects suiiiciently into the slots in the ends of the case to hold the strips firmly in position. The projecting ends are then enclosed in a member il, lf'ig. G, shaped to provide a blade terminal which can be introduced into the usual spring blade terminals of the line Wires. The terminal member in this case is made ot a sheet or strip of copper having its sides bent up and its edges overlapped, as shown in Fig. 7, and having a iiange on its cuter end which is bent over as at 15, in Fig. 6, to close this end. The mouth oit the terminal member is flared and the sides have sufficient strength so that they may be forced over the projecting ends of the 'fuse strips and has flanges analogous to the thing oit Fw. 2 vwhich are tasteried to the enfi nece of the easing. A wedge l?, also termed by foldii'ig a short piece ot copper along its .lower edge is forced into 1he space between the strip 2 and one of the tongrlee le. The tongues 16, therefore, constitute the outer parte of a blade which is in clone rictional Contact with the end of the frise strip.

Though- I have described with .@'reat tioularity ot detail certain spec c ments of my invention, yet it is not to be understood tl'ierefroni that the invention ie restricted to the particular embodiment eieclosed. Various inodiiicatione thereof in detail and in the arrangement oi: the l artis and in the method ot' assembling the-1n may be nizide by those Siiilled in the art without departing' from the invention zie delinod in the :following` claims.

l. fuse oase with an openinij through one of its ends and with inwardly projette ingr tongues on opposite sides of :said open- 'infrv adapted to embrace the fuse strip, Said tongues having a parigei'vay between them which ie open at the outer end so that a uee strip can be inserted from the ontt-iide7 in combination withl a wedge for fastening the end of the strip between said tongues with a `goed rictionel engagement.

2. A furie comprising a Cese with an opening through its ends, and with inwardly projecting ton on opposite sides of ,said openin hswi :i passageway between them open at its outer end so that iiiile stripe 'can be inserted from vthe outeide, in combinzition with a ihn af ot s ips extendiner through Seid paeeageway at me ende` of the oase and a e nunon "erniinril et earh end engaging the several etripe.

2l. A fuese time with an oiliening` t one of its e de and h inv-mii" u ing tongues on optimierte Hides ot .t ing adapted to embrace the eno. or

Strip, said tongues having; a passage tween them openingg` at its outer end a fnee :stip can be inserted troni the oiiti. .rh its end embraced by iasoened thereto.

1li. uee case hai/'inl' heads on the inside oil' which ere end plates with tongues protened thereto.

In witness whereof l hzwe hereunto gine/fl my name.

THOMAS E. llJIURl-tif. 

